NVMe critical warning byte non-zero
An NVMe device's Critical Warning byte (NVM Express §5.21) is non-zero. Per spec, any non-zero bit is a vendor-recommended immediate-action signal: temperature threshold exceeded, available spare below threshold, reliability degraded, read-only mode, volatile memory backup failed, or persistent memory region read-only.
Remediation
When this rule fires on one of your servers, the dashboard alert detail page renders the full remediation guidance: the command to run, what to verify after, and Furnace's annotation for your specific distro + hardware. Sign in at app.glassmkr.com to see the live alert.